[sane-devel] Plustek Optic Slim 2420

[Maximilian Fabricius]

On 1/1/07, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote:
> Maximilian Fabricius schrieb:
> > Hi all,
> >
> > I have been working on trying to get the OpticSlim 2420 to work.
> > Is disassembled the scanner (hardware) and made pictures. they may be
> > found here
> >
> > http://rosa.physik.tu-berlin.de/~mxhf/OS2420/
> >
> > They are fairly high resolution ~1MB per image so that you can see all
> > details. lease excuse the German on the navigation bar.
>
> This scanner has a Wolfson Micro WM8196 analog frontend, an ICSI
> IC41LV16256-35K memory chip(256k 16bit words), LB1940 motor driver chip.
>
> > From this I learned that the scanner has a GL842 chip (not GL841). The
> > GL842 seems
> > to be very similar to the 841 though as a quick scan through the data
> > sheet revealed.
>
> In fact, at least the things documented in genesys' datasheets are
> identical.
>
> >
> > So far I cloned the ST24 section in genesys_gl841 and
> > I got as far as being able to execute "tstbackend" without getting an
> > error.
> > I had to comment the Init_Devices lines 4990-4993 in genesys_gl841.c.
> >
> > I am somewhat stuck now. Starting scanimage results in strange noise
> > from the scanner.
>
> Try the motor struct i sent in the Canon-4400F thread[1].
>
> Concerning your frontend settings, use the register state just before
> the preview scan starts(which probably is urb 1367 in the log referenced
> in [2]).
>
> By the way: i am preferring usbsnoop[3], which dumps the usb log into a
> plain text file, making parsing it way easier. Also, it does not stop
> logging, when it encounters an urb larger than 16k or so(fortunately for
> you, the plustek driver does not use that large urbs).
>
> Regards,
>   Pierre
>
> [1]
> http://lists.alioth.debian.org/pipermail/sane-devel/2006-December/018335.html
> [2]
> http://lists.alioth.debian.org/pipermail/sane-devel/2007-January/018338.html
> [3]
> http://benoit.papillault.free.fr/usbsnoop/
>


Thanks Pierre,

I am currently playing around with the frontend. I tried setting it to
the values I got from my log.

-- SNIP SNIP ---
{{0x00, 0x27, 0x24, 0x0f}	//reg[4]:	0x00 - 0x03
   , {0x00, 0x00, 0x0f}		//sign[3]: 0x00 - 0x06
   , {0x02, 0x01, 0x01}		//offset[3]: 0x20 - 0x22
   , {0xc4, 0xc8, 0xd2}		//gain[3]: 0x28 - 0x2a
   , {0x00, 0x00, 0x00}		//reg2[3]
   }
  ,				/* OS2420 */
-- SNIP SNIP ---

I also used your motor struc.
So far the scanner starts moving the ... sled? And only the green
light is powered on. But the sled only moves for about a cm. Then it
starts making noise like a quiet machine gun.
I am not done playing around and haven't double checked my frontend
register values yet.

It might help to understand what they actually mean.

Do you have a reference?

Max